I have a friend who habitually brings a Tupperware container when she goes to a restaurant, so she can take home about half of her meal. Most people would just accept the styrofoam box offered by the restaurant, but Tupperware makes a tighter seal, and she can safely put it in her purse.

I once watched a supermarket employee stocking the shelves with bananas. As he took them out of the box, he would occasionally find a single banana, not attached to any others. He threw these into another box, to be taken away. He had accumulated several. I don't know what he was going to do with them. This must happen a lot, because I don't recall ever seeing a single unattached banana on the shelf. Do people ever buy just one banana?